Novel 4,5-dihydro-4-oxo-pyrollo (1,2-a)quinoxalinones and corresponding aza analogs and a process for their preparation

摘要

The invention relates to novel compounds of the formula in which the phenyl ring can also contain a nitrogen atom instead of a CH group, and R1 is C2-C6-alkenyl, C2-C6-alkynyl, hydroxyl, C1-C6-alkoxy, C3-C6 -alkenyloxy, C3-C6-alkynyloxy, C2-C6-alkanoyloxy, benzoyloxy, morpholinocarbonyloxy, C1-C6-alkyloxycarbonyloxy, C1-C6-alkylaminocarbonyloxy, C1-C6-dialkylaminocarbonyloxy or the group -Alk-A, in which Alk denotes C1-C6-alkyl, C2-C6-hydroxyalkyl or C3-C6-cycloalkyl and the symbol A represents hydrogen or other substituents. R2, R3 and R4 represent various substitutents, where R1 can also be hydrogen if R2 is and R5 represents phenyl, C1-C4-alkoxyphenyl or diphenylmethyl and R3 and R4 are hydrogen, and to their salts. The invention furthermore relates to a novel process for the preparation of starting substances for the compounds of the formula I.